Albeet h



(No Model.)

A. H. EMERY. PRESSURE GAGE.

Patented J INVENTOR- N. PETERS Phombthognphor. Washmglon. u a

, fulcrumed to the ease by compound flexible the following is a specification.

levers are made double, constituting wide UNITED STATES ATENT OFFICE.

ALBERT H. EMERY, OF NElV YORK, N.

COMPANY, OF STAMFORD, CONNECTICUT.

PRESSURE-GAGE.

SPECIFICATION forming part of Letters Patent No. 278,910, dated June 5, 1883.

Application filed February 5, 1881. (N0 model.)

To call whom it'may concern Be it known that I, ALBERT H. EMERY, of the city, county, and State of New York, have invented certain new and useful Improvements in Pressure or Vacuum Gages, of which This gage is constructed with a pressurechamber permanently attached to a chamberbase which is removable from the base of the gage and from the pressure-0011111111 or a part thereof. The column may be formed in two parts, the lower being attached to the pressurechamber diaphragm. The removable chamber is tightly clamped between the casing and the base of the gage by means of screws. A removable fulcrum-block, secured to the base by the same or other screws, forms an attach ment for the flexible fulcrum-platcs of one or more transmitting-levers, and for a-standard constituting the front bearing of the rotary indicator. A secondary transmitting-lever is plates connected by an intermediate clamping piece, affording limited horizontal play to the fulcrum. This lever is held against longitudi nal motion by a flexible fixing-plate constituting a spring, which serves also as the pressure-resisting spring, and is attached adjustably to the fulcrum-block. The transmitting frames, and are thus adapted to receive transmitting-plates, which are made thin for flexibility and wide for strengtl'l. The width of the lever-frames and connecting-plates also adapts them to transmit their pressure in a vertical plane without lateral or oblique strain. A hair-spring is provided to offer such slight resistance to the rotation of the indicator as will serve to keep the parts taut. The final lever of the series is preferably mounted on a fulcrum block constructed with two arcs, around which its flexible fulcrum-plate and the flexible plate which connects it to the intermediate lever are respectively drawn in order to keep the fulcrum-points in the same horizontal line. An adjustable stop limits the downward movement of this lever when pressure is withdrawn. Stop 'screws are employed to limit the vertical movement of the interme diate lever. From the final lever motion is communicated to the rotary indicator by a coiled metallic band. The indicator-pivots run in jeweled bearings, one of which is mounted in a supporting and adjusting screw.

The invention is represented in the accompanying drawings by four figures, numbered 122 to 125, inclusive. Figure 122 is a front elevation of agage. Fig. 123 is a horizontal sec tion of the same. Fig. 124c is a vertical section of the base, showing the liquid-pressure 6o chamber and its attachments. Fig. 125 is a detached elevation of the fulcrum and attachments of the last transmitting-lever.

821 represents acylindrical casing provided with a dial, 822. The glass front 823 is set in a frame, 848, attached to the case in any preferred manner. A packing, 84.9, of leather or other suitable material, is interposed between the glass and its frame.

824 represents a base-piece connected with the casing by screw-bolts S25, and serving also to connect an annular fulcrum-block, 826, by which the primary lever, hereinafter described, is attached to the case. p The fulcrumbloek 826 may, if preferred, be attached to the 7 5' neck of the ease by separate screws. The base 821 is formed with an annular flange, as shown in Fig. 121, projecting upward within the neck of the case in contact with a plate, 827, forming the base of a removable pressurechamber. The pressure-diaphragm 828 is secured at its outer edge to the chamber base plate 827, and when made in annular form, as in the present illustration, is secured at its in ner edge to the lower part of a pressure-colman, 830 831. The outer edge of the dia phragm is clamped by a casing-ring, 829, in terposed between the chambeigbase S27 and a shoulder within the case. The pressure-chamber base 827 has a central pressure-duct, 850, 0 and is tapped, as shown, with a screw-thread, to receive a screw-plug for attaching the liquid pressure pipe. The diaphragm of the pressure chamber may be either made annular, as shown, and attached to the base of the pressure-col- 5 -umn, or it may consist of a continuous disk with the pressure column resting upon it, either with or without a separate casing-ring, S29, interposed between the case 821 and the base 827 of the pressure-chamber. This con- 10o struction adapts the entire pressure-ehamber, consisting of the chamber-base S27 and diaphragm 82S, casing-ring S29, and the base 830 of the pressure-column, to be removed from the case when the latter is taken off its base 82%. The pressure column 831 carries a clamping-plate, 832, securing thereto the lower edge of the thin flexible transmitting-plate 833, the upper edge of whichis clamped by the block 857 and screws 858 to a lever, 831L, fulcrumed by a flexible plate, 835, to the standard 851 of the fulcrunrblock 826. The fulcrumplate 835 is attached to the lever 83. by clampplate 860 and screws 85S, and to the fulcrumblock 851 by clamp-plate 861 and screws 862. The block 857 is fastened to the lever 83f by screws S58 and 859. The fulcrum-block S26 is of annular form, encircling; the pressure-column, and is constructed with a slight hub or shoulder resting within a recess in the neck of the casing 821, as shown in Figs. 12 and 124, to secure the said fulcrum-block or bracket against lateral motion while it is held down to the neck of the casing by bolts 825. The free end of the lever S34c is connected by a thin flexible plate, 836, and clamps SGT with a secondary double lever, 83? fulcrumed to the case through the medium of clamps 865 866 and two thin flexible plates, S38 863, which are connected by a rigid clamping-piece, 839. This attachment permits the horizontal motion of the fulcrum 83 due to the vertical movement of the lever. The free end of the lever 83? connects by a flexible plate, 84:0, and clamps 867 with the upper part,ot' a fulcrum-block, Sll, carrying an arm, 8&2, secured thereto by clampingscrews 868, which serve also to clamp thereto the lower end of the suspendingplate Sit). The upper end of the plate 843 is clamped to the ease by plates and screws Sll. To the ex tremity ot' the lever S42 aflexible transmittingband, 845, is clamped adjustably by a plate and screws, 869. The said transmittiiig-band is coiled around a smalldrum, S52, onthe shaft 853 of the indicator 846. A hair-spring, 847, connected at one end to the shaft or drum of the indicator and at the: other end to the lever S37 by a slotted pin, 854, resists the rotation imparted to the indicator by an upward movement of the levers above described, and serves to keep the connections at a proper tension. The main resistance to the pressure is by the spring 855, which. is clamped atone end adj ustably to the top of the standard 851 by the slotted plates S and screws S71, and at the other end to the free end of the lever 837 by clamp 856. The spring-plate S55 serves also to fix the lever 837 against horizontal mot-ion. For automatic adjustment to counteract the effect of changes in temperature, a rod, 872, is provided, of metal either more or less expansible than the material of the case, said rod being fixed adjustably in the case, as shown, and connected by clamps 873 to a plate-spring, 874, which is clamped to the lever 837 near its fulcrum end by plates S and screws 876. By the vertical adjustment of the rod it may be made to increase or decrease the strain upon the spring, and to exert a strain. either upward or downward, as required to bring the indicator to zero. If found necessary to compensate for changes in temperature, the rod may be applied underthe lever S3'T,instead of above it, as here shown.

S77 is a stationary rod rising from the standard S51, and provided with a nut, 878, which constitutes an adjustable stop to limit the descent of the lever 8T2. The action of this stop is to limit the downward movement of the lever 842 at such time that the band S45Yshall not be loosened on its barrel by the farther movement of the leverafter the rotation of the indicator is stopped by its having reached the limit of its permitted movement. In practice it is best to so adjust the said stop-nut 878 that the lever 842 will strike it just before the nee dle completes its movement, so that the living force of the needle or indicator is partially consumed by the elastic action of the lever 842, band 845, arbor S53, and needle SlG. The resultis, that the needle strikes very gently at the limit of its motion. It is preferred to thread the rod 877 to its upper end and employ a second nut above the lever to limit its upward play. The fulcrum of the said lever 8&2 is preferably constructed as shown at 880 in Fig. 125, the flexible plates or metallic straps 8-H) 8&3 being secured to the said fulcrum by screws S81 and clamp-plates S7 9, an d stretched around arcs, as represented, so that the fulcrum dist anees will remain unchanged under a deflec tion of the lever. The shaft 853 of the rotary indicator runs in jeweled bearings 882 883, which are set in standards SSl 8843', fixed to the annular fulcrum-block 826 by screws 88st". The

vert' -al motion of the lever S37 is limited by stop-screws 885 SS6 coming in contact with lugs 888 SS7, projecting inward from the case 821, the lug S88 constituting the boss for the attachment of the clamp 84ft.

Any novel subject-matter I have set forth and not claimed or attempted to claim in this application I have claimed or attempted to claim in other applications or have reserved to be claimed in future original applications.

The following is here claimed as new:

l. The combination of the gage-case S21, base-piece 824, chamber-base S27, and connecting-screws S25,"as and for the purposes set forth.

2. The combination of the removable pressure-chamber, the pressure-column, and the gage-case, as and for the purposes set forth.

3. The combination of the gage-case 821, the,

pressure-column 830 831, made in two separable pieces, the remo "able pressure-chamber 827 828, and the transmitting-plate 833, as and for the purposes set forth.

4. The combination of the gage-case821, base 824, pressure-chamber S27 S28, pressure-column S30 S31, fulcrum-block 826, and fixingscrews 825, as and for the purposes set forth.

The ihlcrum-plates S38 S63 and clamp plates 839, in combination with the lever 837 and gage-case 821, as and for the purposes set forth.

6. The combination of the fulcrum-block 826, vertical motion of said lever, substantially as the standards SS4: 884, and the shaft 853 of the rotary indicator, substantially as set forth.

7. The combination, with the load-lever 837 and fulcrum-block S26 851, of the-fixing and resisting spring 855, arranged as described, to secure the lei'er against longitudinal or lateral motion.

8. The combination of the gage-case 821, pro- 10 jecting lugs 887 S88, load-lever 837, and stopscrews S85 886, as and for the purposes set forth. m

9. In combination with a lever, 842, actuating a rotary indicator, 846, a standard or rod, 877,

I 5 and one or more stop-nuts, 878, to limit the set forth.

10. In combination with the leverarm 842 y and indicator-needle 846, having elastic connec- 

